staging: rtl8192u: Remove typedef for struct _RX_REORDER_ENTRY

-Avoid typedefs for structure types to maintain kernel coding style.
-Remove typedefs RX_REORDER_ENTRY  and *PRX_REORDER_ENTRY  of struct _RX_REORDER_ENTRY .
-Change Structure name _RX_REORDER_ENTRY  to rx_reorder_entry to maintain Linux kernel Coding Style.
-Replace occurences of RX_REORDER_ENTRY  to struct rx_reorder_entry.
-Replace occurences of PRX_REORDER_ENTRY  to struct rx_reorder_entry *.

Signed-off-by: Bhanusree Pola <bhanusreemahesh@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>